From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Sat, 6 Sep 2008 17:33:24 +0000 (+0100)
Subject: ALSA: ASoC: Use codec digital mute when stopping playback
X-Git-Tag: v2.6.28-rc1~720^2~89
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=6010b2da1f11752dd58191423fc9878b0ce420c8;p=linux-2.6-omap-h63xx.git

ALSA: ASoC: Use codec digital mute when stopping playback

Muting the DAC masks artefacts introduced as the digital stream shuts
down, for example when the input stops being clocked.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 1563ceedf61..ad381138fc2 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -340,6 +340,12 @@ static int soc_codec_close(struct snd_pcm_substream *substream)
 	}
 	codec->active--;
 
+	/* Muting the DAC suppresses artifacts caused during digital
+	 * shutdown, for example from stopping clocks.
+	 */
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		snd_soc_dai_digital_mute(codec_dai, 1);
+
 	if (cpu_dai->ops.shutdown)
 		cpu_dai->ops.shutdown(substream);